Glass tubing.



No; 686,009. Patented Nov; 5, l90l. c. E. WADE.

GLASS TUBiNG.

- (Applica tion filed Nov. '22, 1889.)

(No Model.)

V 0 M M .0 m w 5% n V. A. mfiw.v L m .v I, v

i W H NlTED STATES PATENT FFICE.

cnARLEs E. WADE, on SOBANTON, PENNSYLVANIA, ASSIGNOR To The LAcKAwANNA LUBRIOATOR AND MANUFACTURING COMPANY, on

GLASS TUBING.

SPEGIJEIIGA'IION forming part of Letters Patent No. 686,009, dated November 5, 1901. Application filed November 22', 1899. Serial No. 737,897. (No moclcLl To aZZ whom it may concern.-

Be it known that I, CHARLES E. WADE, a citizen of the United States,residing at Scranton, in the county of Lackawanna and State of Pennsylvania, have invented certain new and useful Improvements in Glass Tubing, of

which the following is a specification, referthereby removing the danger from using glass tubes subjected to pressure. Other objects are such as hereinafter appear and are more fully pointed out in the claims.

To this end the invention consists of the construction, combination, and arrangement of the parts herein specified, and illustrated in the accompanying drawings, in which- Figure 1 is a side elevation of a piece of glass tubingembodying my invention, a part thereof being broken away to show the structure in cross-section. Fig. 2 is atransverse cross-section of the same on line 00 aaof Fig. 1. Fig. 3 is a diagram of the lamina of mica or ther suitable material which is to be embeded in the walls of the glass.

Similar figures of reference denote like and corresponding parts throughout the several views.

Referring to the drawingsyl designates a glass tube made according to my invention and suitable for use as 'a sight-tube in lubricators for steam-engines and other purposes. Various lengths may be made, but short lengths are usually what are required for the purpose, such as can' readily be cut from pieces of mica, a layer of which (designated 6) is embedded within the walls of the tube. The mica or other suitable tough transparent material is preferably prosided with perforations or holes 7 '7, 850., as shown in the view in Fig. 3. A plurality of strips of mica overlapping or intermeshing with one another, allowing interstices, might readily be substituted for a perforated piece, as shown.

The mica is inserted into the glass by forming the mica part into tubular form, as required, and setting it into the mold designed to receive the glass, which is forced into the mold in the molten state and forced through and around the mica, thoroughly embedding it into the walls of the tube, after which the tube is removed from the molds and its ends reheated and smoothed. m

Since sight-tubes in lubricators and boilers are liable to be exploded by pressure and theflying pieces thereof render it dangerous to attendants, the purpose and utility of my invention and operation thereof are readily understood. The web or lamina embedded in the glass is designed to hold it from disintegration when cracked and it is also intended to make the tube stronger, so as to be less liable to break. Tubes of the kind being in expensive the cost of the tube is less serious than the danger to the attendant, as many persons are severely scalded and out about the face and hands and have even lost their eyesight from explosions of such tubes. By providing a means to prevent disintegration of the glass upon cracking I eliminate the damger referred to, as it is well known that valves are placed within the passages leading from the sight-tube space to the boiler in connection with which it is used, so thatif the tube is broken by an explosion the flow of steam is automatically shut ofi after the explosion by the valves just mentioned. Now in case my tube is used after the tube is cracked and the pressure becomes relieved by the steam and water oozing out through the crack the valves aforesaid will close ofi automatically as long as the pressure is relieved in the sight-tube by any sufficient opening, thus greatly obviating the danger from flying pieces of the bursting tube.

Having thus described my invention, what I claim as new, and desire to secure by Letters Patent, is-- 1. A glass tube constructed with a netting 3. A glass tube of the kind described constructed with a foraminated layer of thin transparent tough material embedded within its walls, the glass extending through the foraminations of said material and binding the outer and inner layers of glass together, substantially as specified.

In testimony whereof I affix my signature in presence of two witnesses.

CHARLES E. WADE.

Witnesses:

LESTER ROCKWELL, D. G. MORAN. 

